biblatex-subseries – Manages subseries with BibLaTeX

Some pub­lish­ers or­ga­nize book se­ries with sub­series. In this case,
two num­bers are as­so­ci­ated with one vol­ume: the num­ber in­side the
se­ries and the num­ber in­side the sub­series. That is the case of the
se­ries Cor­pus Scrip­to­rium Chris­tiano­rum Ori­en­tal­ium pub­lished by Peeters.
This pack­age pro­vides new fields to man­age such sys­tem.